Trench hoe



A. ORLOFF TRENCH HOE Feb. 17, 1931.

Filed April 22. 1929 urk.

31a/vento@ N @NBN Patented' Feb. 17, 1931 UNITED STATESy PATENT oFFl'cE ARTHUR ORIOFF, OF GREEN BAY, WISCONSIN, ASSIG-NOR T0 NORTHWEST ENGINEER- ING CORPORATION, OF GREEN BAY, WISCONSIN, A CORPORATION E WISCONSIN TRENCH HOE Application led April 22,

The invention relates to excavators and more particularly those of the type usually called pull shovels, trench hoes or back diggers.

The usual types of pull shovels, wherein the hoist cable extends out to the outer end of the boom and over sheaves at the end of the boom or associated with the dipper stick so that said hoistinglline and sheaves .get into 1 the trench during digging, present a fruitful source of trouble inasmuch as it is impossible to keep dirt and gritfrom falling into the sheaves, with'resultant troubles dueto rapid wearing of the moving'parts, particularly the cable, as when small stones get between the cable and the sheaves, cuttin and consequent breakage are apt to result.; ccording to the present invention these'y disadvantages are overcome by providing a hoistingcable separate from the dipper stick to raise and lower the boom and to utilize the tension of the hoist cable su port to eiect the operation of another ca le which moves the dipper and its stick angularly relative to the boom.

A further object of this invention is to connect the shear legcable with the dipper stick to eiect the an ar movement of the dipper relative to the oom through the tension set up in the shear leg supporting cables, the arrangement eliminating the necessity for sheaves'at the forward end ofthe machine and permitting the use of a simple cable connection with the dipper stick.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings Fig. 1 is anelevationalV view of an excavator embodying the invendown on the'inclined shear leg to'show the arrangement of the cables.

Referrin to designates he traveling base of the machine equipped with endless propelling treads 5 driven in known manner Vfrom a suitable prime mover on the rotating base 6 of the machine, 7 a boom pivotally connected with the rotating base of the machine' :for up and Y down movements relative theretoe as by a pin -carried thereby and paying out of this cable tion. Fig. 2' is a detail planv view lookingVV portion of the'dipper stick 9. The shear leg the drawings the numeral v4 Y 1929.I serial No. 357,066.

8, 9 the dipper handle or stick pivotally connected intermediate its ends by pin 10 to the outer end of the boom and carrylng a dipper 11 facing toward the machine'and equipped with digging teeth 12.

The usual drag cable 13 passes from the drag drum 14 over a pulley or sheave 15 on the boom 7 to a point of pivotal connection at 16 with the dipper, the winding in of the drag cable Swingin the dipper and its handle inwardly towar the machine to eifect a digging movement when the boom is lowered and in operative position relative to the trench and to eifect the retention of the load in the dipper when the boom is in an elevated position.

For raising and lowering the boom, dipper and stick a hoisting cable 17 passes from the hoist drum 18 over a guide sheave 19 mounted on a pin 19 on a movable support or shear leg 20, thence around a sheave 21, mounted on the medial portion of the boom or back from its forward end and is dead ended at22 upon the shear leg 20. Thus winding in on the hoisting cable raises the boom 7 and parts 'I5 lowers these parts.

The drums 14 and 18 are equiped as usual with brakes and clutches to control their operation.

The shear leg or dipper shifting cable 23 is suitably secured at one end to the machine,

as by a dead end connection 24, and extends vtherefrom over a guide sheave 25, thence Tover a sheave 26 -pivotally mounted on the pin 19 on the' shear leg and thence down around a pulley 27 pivotally mounted'on the lower portion of said shear leg and thence' forwardly along the top of the boom to a pivotal dead end connection 28 'near the upper is pivotally supported on the machine in any suitable manner, as b the pivot pin 8.

It is obvious that t e weight ofthe boom 7, dipper 11 and dipper stick 9 and various parts. connected therewith will normally 2 cause a tension to be extended in the boom hoist cable 17 and as one end of this cable is associated with the shear leg 20 carrying the shear le cable 23 that the tension in said hoistca wi1l,inturn, cause atensiontobe I exerted in the cable 23 in orderthat the shear leg may be supported and that this tension in the cable 23 is further increased by the weight of the shear leg. If, with the boom, dipper stick and dipper in the solid llne position shown, the bra e on the drag drum 14 is released, the tensioned shear leg cable 23 will effect an outward swinging ofthe dip-- per and its stick with respect to the boom, as noted by the dotted line position, it being noted that under these conditions the shear leg swings to the right about its pivotal mounting 8 until it occupies the dotted position shown, this movement causing an effective shortening of the length of the cable 23 between the sheave 27 and the end 28. The reverse of this operation, namely, the drawv ing in of drag cable 13 'until the dipper and wardly or inwardly relative to the boom under the control of the drag line and the position of the boom, the dipper and its stick, to accomplish the digging or unloadthe hoist line, it being noted that when the dipper is in the dottedy line position and.

lowered into the material to be excavated that pulling in on the drag line causes the dipper to dig through and scoop up its load of material, which is then raised on the raising of the boom and discharged either by swinging the dipper outwardly relative to the boom or by providing the dipper with a bottom dumping door, long well known in excavators, or by providing other forms of discharge which form no part ofthe present invention.

From the foregoing description it will be noted that I have provided a pull shovel construction in which the tensioning of the shea-r leg or hoist cable support is used to effect the movement of the shear legcable, which is operatively connected to the di per handle to effect shifting movements ofp the dipper and dipper stick.

I desire it to be understood that this invention is not to be limited to any particular form or arrangement of parts exce t. insofar as such limitations are included in t e claims.

at I claim as my invention is:

1. In an excavating machine, the combination with a vboom mounted for up and down movements, a dipper handle pivotally mounted on the outer end portion ofsaid m and carrying a dipper working toward themachme during di ging, a hoisting cable amociated with the oom, and means, in-

wardly toward said boom.

mounted on the outer'end portion of said boom and carrying a dipper working toward the machine during digging, a hoisting cable associated with the boom, a movable shear leg and a cable supporting said shear leg and associated with said dipper handle for shifting the dipper outwardly relative to the boom during the cycle of operations of the machine.

3. In an excavating machine, the combination with a boom mounted for up and down movements, a dipper handle pivotally mounted on the outer end-A portion of the boom and carrying a dipper-working toward the machine during digging, a hoisting cable associated with the boom, boom-supporting means including a movable shear leg as sociated with the hoisting cable, and a shear leg cable tensioned by said shear leg and connected to said dipper stick to shift the same on the shifting of said shear leg. 4. In an excavating machine, the combivnation with a boom mounted for up and lng operatlon, 1s also under` the control of d own movements, a dipper handle pivotally mounted on the outer end portion of said boom and carrying a dipper working toward the machine during digging, a hoisting can ble associated with the boom, means includ ing a movable hoisting cable support for effecting outward shifting of the dipper relative to the boom under the tension of said support, and means opposing the outward shift of said dipper and for swinging it in- 5. In an excavating machine, the combination with a boom mounted for up and down movements, a dipper handle pivotally mounted on the'outer end portion of said boom andcarrying a dipper working toward the machine during digging, a hoisting cable associated with the boom, a shear leg cable associated with said dipper handle for shifting the dipper outwardly relative to the boom, a movable shear leg for tensioning said shear leg-cable, and a. separately'controlled third cable opposing the out ard shift of said dipper and for swinging i 1liwardly toward said boom.

6. In an excavating machine, the combination with a boom mounted for up and down movements, a dipper handle pivotally mounted on the outer end portion of said boom and carrying a dipper working toward the machine during digging, a. hoisting cable associated with the boom, a movable shear leg associated with said hoisting cable, a shear leg cable having a bight about said shear le and connected to said dipper handle for shi ing said dipper outwardly relative to the boom under the tension set up by said shear leg, and a separatel controlled cable for opposing said outwar shifting and for shifting said dipper inwardly toward the boom.

7. In an excavating machine, the combination with a boom mounted for up and down movements, a dipper handle pivotally -mounted on the outer end portion of said boom and carrying a dipper working toward the machine during digging, ahoisting cable associated with the boom, a pivoted shear leg with which said hoisting cable is connected, spaced shea-ves mounted on said shear leg, a cable extending 'from the machine around the upper of said sheaves and over the lower ofA said sheaves to the upper end of the dipper handle for shifting said dipper outwardly relative to the boom, 'and a separately controlledv cable for opposing said outward shifting and for shifting said dipper inwardly toward the boom.

In testimony whereof, I atix my' signature.

ARTHUR ORLOFF. 

